InnoDB to MyISAM Conversion Problem

Question

I have a dedicated server based on CentOS 5 OS , mysql 5 and phpmyadmin

I was trying to convert all database tables from InnoDB to MYISAM. I tried to do it by setting in /etc/my.cnf file the value

skip-innodb 

Afterwards, I found some errors in some php scripts in the server

Unknown table engine 'InnoDB'

I checked some databases in phpmyadmin i found in each database some tables IN USE

How can I make a successful conversion of all tables from InnoDB to MyISAM ?

Answer 1

Setting skip-innodb does disable the InnoDB Storage Engine, but that does not convert the tables.

You need to script the conversion of all the tables.

STEP #1

Comment out the skip-innodb

[mysqld]
#skip-innodb

STEP #2

service mysql restart

STEP #3

Execute the Following Script snf View Results

CONVERT_SCRIPT=/tmp/InnoDBConversionToMyISAM.sql
SQL="SELECT CONCAT('ALTER TABLE ',table_schema,'.',table_name,' ENGINE=MyISAM;') "
SQL="${SQL} FROM information_schema.tables "
SQL="${SQL} WHERE engine='InnoDB' AND table_schema <> 'mysql'"
mysql -uroot -p -ANe"${SQL}" > ${CONVERT_SCRIPT}

STEP #4

View the script

vi /tmp/InnoDBConversionToMyISAM.sql

or

less /tmp/InnoDBConversionToMyISAM.sql

If you like the contents, then ...

STEP #5

Login to mysql and run

mysql> source /tmp/InnoDBConversionToMyISAM.sql

STEP #6

Uncomment out the skip-innodb

[mysqld]
skip-innodb

STEP #7

service mysql restart

STEP #8

There is no STEP 8. That's it !!!

Give it a Try !!!